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67 Posts
First off I have a 98 Vette, the car is highly modified to include an engine swap from a LS1 to a Supercharged LS6. About a year ago I started to loose fuel pressure during a heavy load / hard acceleration. "Not a good thing on a supercharged car". it would seem that if I give the car full throttle my fuel pressure will actually drop to zero and I believe this to be a true reading for several reasons. #1 the car looses a considerable amount of power, I've ohmed the fuel pressure sending unit and its fine, my last 255lpm fuel pump was getting loud so I changed that out for a new one in addition I have a fuel boost-a-pump as well which I'm sure most of you know is nothing but a vacuum actuated voltage capacitor so to speak. New pump no change, new boost-a-pump no change, replaced the TPS, MAP, replaced the fuel pressure regulator, disconnect the vacuum line to the fuel pressure regulator no change, I have no engine codes that relate to this issue, just the typical C5 P1571 and P1644 TPS codes.
The unfortunate side to this is that I have spent a ton on money trying to figure out this issue at all sorts of Tuner, and Dyno shops with no good results or a cause for this issue. I don't go to dealers for fear they will erase my tuning from the PCM, they already did it once to me and I got stuck paying to re-tune and dyno the car.
Any assistance any of you could offer would be greatly appreciated.
The unfortunate side to this is that I have spent a ton on money trying to figure out this issue at all sorts of Tuner, and Dyno shops with no good results or a cause for this issue. I don't go to dealers for fear they will erase my tuning from the PCM, they already did it once to me and I got stuck paying to re-tune and dyno the car.
Any assistance any of you could offer would be greatly appreciated.